Question

Which of the following has the highest mass?

• A. 1 g of atom of C
• B. 1/2 mole of CH₄
• C. 10 ml of water
• D. 3.011 x 10²³ atoms of oxygen

Answer 1

A. 1 g of atom of C corresponds to 12 g.
B.1 mole of $C{H}_4$ =16g
$\frac{1}{2}$ mole of $C{H}_4$ = $\frac{16}{2}=8g$
C. Density = $\frac{Mass}{volume}$
10 ml of water corresponds to 10 g as the density is 1 g/mL.
D. $6.022\times {10}^{23}$ atoms of oxygen = 16g
1 atom of oxygen = $\frac{16}{6.022\times {10}^{23}}$
$3.011\times {10}^{23}$ atoms of oxygen = $\frac{16}{6.022\times {10}^{23}}\times 3.011\times {10}^{23}=8g$
Hence, the correct option is A